diff --git a/dlls/sxs/Makefile.in b/dlls/sxs/Makefile.in
index d6d6f2bbbf1..a1079280e66 100644
--- a/dlls/sxs/Makefile.in
+++ b/dlls/sxs/Makefile.in
@@ -1,6 +1,7 @@
 MODULE    = sxs.dll
 IMPORTS   = oleaut32 ole32
 IMPORTLIB = sxs
+EXTRADEFS = -DWIDL_C_INLINE_WRAPPERS
 
 C_SRCS = \
 	cache.c \
diff --git a/dlls/sxs/cache.c b/dlls/sxs/cache.c
index 46686e541fe..791a6ed0499 100644
--- a/dlls/sxs/cache.c
+++ b/dlls/sxs/cache.c
@@ -69,7 +69,7 @@ static HRESULT WINAPI cache_QueryInterface(
     if (IsEqualIID(riid, &IID_IUnknown) ||
         IsEqualIID(riid, &IID_IAssemblyCache))
     {
-        IUnknown_AddRef( iface );
+        IAssemblyCache_AddRef( iface );
         *obj = cache;
         return S_OK;
     }
diff --git a/dlls/sxs/name.c b/dlls/sxs/name.c
index 9ca911be0d7..bb7f094169f 100644
--- a/dlls/sxs/name.c
+++ b/dlls/sxs/name.c
@@ -68,7 +68,7 @@ static HRESULT WINAPI name_QueryInterface(
     if (IsEqualIID( riid, &IID_IUnknown ) ||
         IsEqualIID( riid, &IID_IAssemblyName ))
     {
-        IUnknown_AddRef( iface );
+        IAssemblyName_AddRef( iface );
         *obj = name;
         return S_OK;
     }
diff --git a/dlls/sxs/tests/Makefile.in b/dlls/sxs/tests/Makefile.in
index 2f8be9c12e1..69305aeb2a0 100644
--- a/dlls/sxs/tests/Makefile.in
+++ b/dlls/sxs/tests/Makefile.in
@@ -1,5 +1,6 @@
 TESTDLL   = sxs.dll
 IMPORTS   = sxs
+EXTRADEFS = -DWIDL_C_INLINE_WRAPPERS
 
 C_SRCS = \
 	cache.c \